99 GT Clutch not Disengaging

I'm going to ask the dumb question, did you install the disc correctly? Meaning, the flat surface goes toward the flywheel with the spring setup toward the transmission. Other items if done right would be cable adjustment and/or "automatic adjuster" on clutch pedal (I hate those things).

No harm asking, but glad you know. Now, if the fork is on the ball it would work correctly through travel. The TO bearing usually is right on the fingers of the disc when adjusted. If the clutch is being depressed the fork goes forward to exert pressure on the fingers to release the disc. Unless the disc/cover is wrong, I see no reason for it not to work unless the cable adjuster mechanism on the pedal is bad. I've seen these strip to the point you get travel but not enough clutch action. This is one thing I do not have on the cars I own or do work on. I just had a customer with both, yes both, the manual and automatic cable adjuster on!

Some clutch manufacturers (I use Centerforce) have the user insure the correct distance of the ball on the housing to insure correct operation. I doubt that is the problem but worth investigating at last resort.

Another item is to insure there's no "protective" film on the cover and/or flywheel when replacing them. You need to wipe them clean with solvent type spray grease remover to get the film off.